Angular flux creep contributions in YBa2Cu3O7−δ nanocomposites from electrical transport measurements

Vallès, Ferran; Palau, Anna; Rouco, V.; Mundet, Bernat; Obradors, X.; Puig, T.

doi:10.1038/s41598-018-24392-1

Cited by 14 publications

(7 citation statements)

References 32 publications

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“…) [2,4,60] and BSCCO 50 60 g = ( ) [3,61] (although steps towards a lowering of the YBCO anisotropy have been recently done [62][63][64][65]), limits the possible technological applications because it produces weak pinning and relevant thermal fluctuations.…”

Section: | Decreases Faster Than the J C H Ab ||mentioning

confidence: 99%

Pinning energy and anisotropy properties of a Fe(Se, Te) iron based superconductor

et al. 2019

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The measurements of DC magnetization M as a function of magnetic field (H) and time (t) have been performed in order to study the superconducting and pinning properties of a Fe(Se, Te) iron based superconductor fabricated by means of the Bridgman technique. By performing the superconducting hysteresis loops M(H) at different temperatures in the case of perpendicular and parallel field, the critical current density Jc(H) has been extracted in the framework of the Bean critical state model for both configurations. The Jc(H) curves have shown the presence of the second magnetization peak effect that causes an anomalous increase in the field dependence of the critical current density. In order to obtain the Jc anisotropy of the sample, we have performed the ratio between perpendicular and parallel critical current density values and compared its values with the literature ones. The information regarding the pinning energy U have been extracted by means of the relaxation of the irreversible magnetization M(t) in the case H∣∣c. In particular, performing relaxation measurements at different temperatures and magnetic fields, the temperature dependence of the pinning energy U(T) at different magnetic fields has been obtained showing an anomalous temperature scaling of the curves. The presence of a maximum in the U(T) curves suggests a pinning crossover at a given field and temperature Hcr(T). The Hcr(T) values have been fitted with the equation Hcr(T) = Hcr(0) (1 − T/T*)n whose results confirm the correlation between the elastic/plastic crossover and the end of the peak effect phenomenon.

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Section: | Decreases Faster Than the J C H Ab ||mentioning

confidence: 99%

Pinning energy and anisotropy properties of a Fe(Se, Te) iron based superconductor

et al. 2019

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“…Actually, time-dependent Ginzburg-Landau simulations confirmed this power law dependence and showed a decrease of α values, simultaneously to the increase of J c (H), when the NP concentration was increased [247,248,255]. Finally, region III is characterized by approaching the irreversibility field and then J c (H) has a much faster decay and also thermal activation effects are reflected in an enhanced flux creep coefficient (figure 32) [256][257][258].…”

Section: Vortex Pinning Landscape: Relationship With Nps and Induced ...mentioning

confidence: 71%

“…The scaling takes into account in this case that near H//c and H//ab there exists additional anisotropic pinning contributions arising from the TBs, in the first case, and the SFs or the intrinsic pinning for the second case (figure 37) [23,242,256,280]. In both types of measurements, it was shown that γ eff decreases with the thin films nanostrain ε, as measured from x-ray diffraction patterns, from γ eff ≈ 5-7 to γ eff ≈ 2.5 (see figure 40).…”

Section: Vortex Pinning Landscape: Relationship With Nps and Induced ...mentioning

confidence: 99%

“…It is therefore unavoidable to investigate the relationship among flux creep rate and the vortex pinning landscape where the influence of the different APCs and defects need to be clarified. This issue has been investigated by several authors in REBCO films, particularly in films grown by the CSD-BaF 2 approach [256][257][258]284] and it was concluded that the main reason for the fast reduction of J c (H) in YBCO thin films at high temperatures is the increase of the creep rate S [258]. An interesting approach was proposed to fasten the study of the correlation of flux creep effects with the defect structure of REBCO films.…”

Section: Vortex Pinning Landscape: Relationship With Nps and Induced ...mentioning

confidence: 99%

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Progress in superconducting REBa₂Cu₃O₇ (RE = rare earth) coated conductors derived from fluorinated solutions

Obradors,

Puig,

Ricart

et al. 2024

Supercond. Sci. Technol.

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In this work, we review recent progress achieved in the use of Chemical Solution Deposition (CSD) based on fluorinated metalorganic precursors to grow superconducting REBCO films and CCs. We examine, first of all, the advances in optimizing the steps related to the solutions preparation, deposition and pyrolysis based on novel low-fluorine metalorganic solutions. We show that a new type of multifunctional colloidal solutions including preformed nanoparticles, can be used to introduce artificial pinning centers (APCs). We analyze how to disentangle the complex physico-chemical transformations occurring during the pyrolysis with the purpose of maximizing the film thicknesses. Understanding the nucleation and growth mechanisms is shown to be critical to achieve a fine tuning of the final microstructure, either using the spontaneous segregation or the colloidal solution approaches, and make industrially scalable this process. Advanced nanostructural studies have deeply modified our understanding of the defect structure and its genealogy. It is remarkable the key role played by the high concentration of randomly distributed and oriented BaMO3 (M=Zr, Hf) nanoparticles which enhance the concentration of APCs, such as stacking faults and the associated partial dislocations.Correlating the defect structure with the critical current density Jc(H,T,) allows to reach a tight control of the vortex pinning properties and to devise a general scheme of the vortex pinning landscape in the whole H – T phase diagram. We also refer to the outstanding recent achievements in enhancing the vortex pinning strength by shifting the carrier concentration in REBCO films towards the overdoped state, where the pinning energy is maximum and so, record values of critical current densities are achieved. This confirms the performance competitiveness of nanocomposite CCs prepared through the CSD route. We conclude with a short summary of the progress in scaling the CC manufacturing using fluorinated solutions.

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“…The logarithmic plots of E versus J as depicted in the inset of figure 9, allows us to calculate ɣ, and the flux pinning energy U given by the relation: 70,71]. The values of ɣ and U are listed in table 3.…”

Section: Electrical Resistivity Measurementsmentioning

confidence: 99%

Investigation of the structural and electrical properties of CdO/(Bi, Pb)−2212 superconducting phase

et al. 2022

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This investigation reports the effect of the addition of CdO nanoparticles on the (Bi,Pb)-2212 superconducting phase. The superconducting samples of general formula (CdO)x Bi1.6 Pb0.4 Sr1.9 Ca1.1Cu2.1 O8 (x = 0.00, 0.01, 0.02, 0.05, and 0.1 wt%) are synthesized using the conventional solid-state reaction technique. Powder X ray diffraction analysis confirms the formation of a single-phase orthorhombic Bi-2212. The variations in the lattice parameters are explained based on the Jahn Teller distortion induced by the increase in the oxygen content owing to the addition of the CdO nanoparticles. The increase in the oxygen content is confirmed via Idiometric titration analysis. The grain morphology is investigated using scanning electron microscopy (SEM). The effect of CdO addition in enhancing grains connectivity by the filing of pores and voids is revealed. Fourier transform infrared (FTIR) spectroscopy is conducted to analyze the functional groups, based on the effect of calcination temperature and CdO addition. Dc-electrical resistivity measurements and I-V characteristics show an enhancement of the superconducting transition temperature (Tc) and the critical current density (Jc) with CdO addition up to x=0.05 wt%, followed by a further decrease. By analyzing the results of the X-ray photoelectron spectroscopy (XPS), the variations of the superconducting properties are explained based on the preferred substitution of Pb2+ ions in the Bi3+ or Cu2+ sites induced by the variations in the oxygen content generated by the addition of CdO nanoparticles.

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Angular flux creep contributions in YBa2Cu3O7−δ nanocomposites from electrical transport measurements

Cited by 14 publications

References 32 publications

Pinning energy and anisotropy properties of a Fe(Se, Te) iron based superconductor

Pinning energy and anisotropy properties of a Fe(Se, Te) iron based superconductor

Progress in superconducting REBa₂Cu₃O₇ (RE = rare earth) coated conductors derived from fluorinated solutions

Investigation of the structural and electrical properties of CdO/(Bi, Pb)−2212 superconducting phase

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Angular flux creep contributions in YBa2Cu3O7−δ nanocomposites from electrical transport measurements

Cited by 14 publications

References 32 publications

Pinning energy and anisotropy properties of a Fe(Se, Te) iron based superconductor

Pinning energy and anisotropy properties of a Fe(Se, Te) iron based superconductor

Progress in superconducting REBa2Cu3O7 (RE = rare earth) coated conductors derived from fluorinated solutions

Investigation of the structural and electrical properties of CdO/(Bi, Pb)−2212 superconducting phase

Contact Info

Product

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Progress in superconducting REBa₂Cu₃O₇ (RE = rare earth) coated conductors derived from fluorinated solutions